Dredger



{No Model.) 4 Sheets-Sheet I.

H. B. ANGELL.

)DRBDGER.

No.- 296,503. Patented Apr. 8, 1884.

n PETERS. Prmv-lilhampher. wmm mm n c.

' (No' Model.) 4 Sheebs-Sheen 3.

H. B. 'ANGELL.

DREDGBR. No. 296,503; Patented-Apr. 8, 1884.

M PETERS. Pimwuihogmaher. wmm p. o. a a

(No Model.) 4 Sheets-Sheet 4.

H. B. ANGELL.

'DREZDGER.

No. 296,503. Patented Apr. 8, 1884.

UNITED Srn'rns' HORACE B. ANGELL, OF SAN FRANCISCO, CALIFORNIA.

DREDGER.

SPECIFICATION fo'rzningpart of Letters Patent No. 296,503, dated April 8, 1884.

Application filed October 15, 1883. (No model.)

To all rah-0772. it 72mg concern.-

Be it known that I, Henson B. ANGELL, of the city and county of San Francisco, and State of California, have invented an Improvement in Dredgers; and I- hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to certain improvements in dredgers, which are employed to excavate the material and elevate it from the bottom to the point of discharge by means of suitable mechanism mounted upon a boat or snow.

The invention consists in the special devices and combinations hereinafter fully described, and clearly indicated in the claims.

Figure 1 is a front elevation of my dredger. Fig. 2 is a side elevation. Fig. 3 is an enlarged view (front elevation) of my gearing apparatus. Fig. 4 is a plan. Fig. 5 is a side elevation. Fig. 6 is an enlarged view, showing one of the drums in vertical section and the rest of the parts in elevation. Fig. 7 is a view showing the brake S.

In a former patent issued to me December 12, 1882, I have shown a method for moving the scow upon which the machinery is placed, from side to side, by means of ropes or chains leading from anchors upon the bank through sheaves or leading-blocks to the scow, and thence around gipsies, which are driven by engines and suitable connecting-gear. WVith this apparatus it is necessary tohave a man in attendance at each gipsy to look after the rope and take it off as fast as it is drawn in or pay it out when the scowis to be swung in the opposite direction, and the gipsies are either allowed to run continuously or may be stopped when not in use. In my present invention I have shown drums to which the ropes or chains are secured, so as to wind upon or unwind from them without the attention of any one, and a means for throwing the mechanism into or out of gear.

A is the snow, having theengines and various dredging apparatus supported upon it in a manner similar to that showniu my former patent. of the apparatus, and have shown only such parts as are essential for the explanation of my invention.

In the present case I have omitted much A is the scow upon which the engines, boilers, and machinery are carried.

B is an elevated bridge upon which the operator stands, and from which he has the oversight ofall the work.

0 is a shaft extending across the scow and having pinions D (see Fig. 4) fixed to it at suitable or convenient points. These piuions engage and drive the gear-wheels E, which are fixed to the drum-shafts F. The rope-drums G turn loosely upon these shafts, and a fric- "tion-wheel, H, is secured to the shaft near one end of each drum, which is formed to engage with the friction-wheel and be turned by it when desired. The drum is held away from the friction-wheel by springs I, and is forced into contact with it, when it is to be rotated, by a lever, J. This lever is connected by a rod, K, with a lever, L, upon the bridge, and this latter lever extends to a point within easy reach of the operator. The ropes or chains M, which are anchored to the bank, pass-through snatch or leading blocks, and are led to the V drums G, to which they are permanently secured, instead of passing around gipsies, and being taken off as they are drawn in. By this mechanism it will be seen that as the ropes are permanently attached to the drums they may be wound upon them by simply throwing the drums and friction-wheels into contact, and when this is done upon one side in order to swing the scow to'that side, the other drum is allowed to turn freely, and the rope will thus unwind from that drum, as it winds upon the other, the whole being controlled from the bridge or other desired point. A brake, S, is fixed to act upon the drum with a constant friction to prevent the rope from unwinding too rapidly and becoming fouled when the drum is running free; but the pressure is not sufiicient to materially retard it.

In my patent of August 30, 1881, I have shown the discharge-pipe supported byropcs or chains from a boom which extends out above it; but when the pipe is long and heavy the boom is not sufficient for the purpose. In the present case I have shown two masts, N'N, having their lower ends stepped upon the bottom timbers of the scow or on deck at some distance apart. Their upper ends approach each other, and also incline outward beyond the side of the scow, the discharge-pipe 0 extending out between them; From their upper ends a single top-mast, 1?, extends upward,

its foot being strongly secured between them, so that it forms an extension of the lower masts. From the top of the mast, and at intervals downward, strong wire-rope guys Q extend back to the framework of the dredge, and thus support it. Other guy-ropes, It, extend from this derrick-mast to points along the pipe, where they are secured to bands '1, and thus support the pipe at intervals.

The guys Q and R form a continuous support from the pipe to the dredger-frame by,

operating the ropes by which the scow is swung 25 from side to side, consisting of the rope-winding drums, and frictionclutches by which they may be engaged or disengaged from the driving-shaft, in combination with the levers J and L and connectingrod K, whereby the drums 0 may be operated from a distant point, substantially as herein described.

2. In a dredging apparatus, and in combination with ropes or chains leading over pulleys' to anchors upon each side of the scow, 35 drums turning loosely at opposite ends of a shaft, and each-having one of the ropes secured to it, friction-clutches by which they may be alternately engaged and disengaged, and levers J L and connecting-rods K, sub- 0 stantially as and for the purpose herein described.

In witness whereof I have hereunto set my hand.

HORACE B. ANGELL.

Witnesses:

S. H. NoURsE, H. OFLEEH 

